//封装购物车模块
import { defineStore } from "pinia";
import { computed, ref } from "vue";
import { useUserStore } from "./user";
import { insertCartAPI, getNewCartListAPI, delCartAPI } from "@/apis/cart";

export const useCartStore = defineStore(
  "cart",
  () => {
    const userStore = useUserStore();
    const isLogin = computed(() => userStore.userInfo.token);
    //1、定义state-cartList
    const cartList = ref([]);
    //获取最新购物车列表函数
    const updateCartList = async () => {
      const res = await getNewCartListAPI();
      cartList.value = res.result;
    };
    //2、定义action
    //添加购物车
    const addCart = async (goods) => {
      const { skuId, count } = goods;
      if (isLogin.value) {
        //登陆之后加入购物车逻辑
        await insertCartAPI({ skuId, count });
        updateCartList();
      } else {
        //购物车添加商品操作,已添加过，count+1，未添加过，push
        //通过匹配传过来的商品对象中的skuId能不能在cartList中找到，找到了则是添加过
        const item = cartList.value.find((item) => goods.skuId === item.skuId);
        if (item) {
          //商品已存在
          item.count++;
        } else {
          //商品不存在
          cartList.value.push(goods);
        }
      }
    };
    //删除购物车商品
    //思路：1、找到要删除项的下标值-splice 2、使用数组的过滤方法-filter
    const delCart = async (skuId) => {
      if (isLogin.value) {
        //调用接口实现删除购物车的商品
        await delCartAPI([skuId]);
        updateCartList();
      } else {
        const idx = cartList.value.findIndex((item) => skuId === item.skuId);
        cartList.value.splice(idx, 1);
      }
    };
    //清除购物车
    const clearCart = () => {
      cartList.value = [];
    };
    //单选功能
    const singleCheck = (skuId, selected) => {
      //通过skuId找到需要修改的那一条数据，将其selected修改为传过来的selected
      const item = cartList.value.find((item) => item.skuId === skuId);
      item.selected = selected;
    };
    //全选功能
    const allCheck = (selected) => {
      //把cartList中的每一项的selected都设置为当前的全选状态
      cartList.value.forEach((item) => (item.selected = selected));
    };

    //计算属性
    //1、总的数量，所有项的count相加2、总价 所有项的count*price之和
    const allCount = computed(() =>
      cartList.value.reduce((a, c) => a + c.count, 0)
    );
    const allPrice = computed(() =>
      cartList.value.reduce((a, c) => a + c.count * c.price, 0)
    );
    //是否全选
    const isAll = computed(() => cartList.value.every((item) => item.selected));
    //已选择数量
    const selectedCount = computed(() =>
      cartList.value
        .filter((item) => item.selected)
        .reduce((a, c) => a + c.count, 0)
    );
    //已选择商品价钱合计
    const selectedPrice = computed(() =>
      cartList.value
        .filter((item) => item.selected)
        .reduce((a, c) => a + c.count * c.price, 0)
    );
    return {
      cartList,
      addCart,
      delCart,
      singleCheck,
      allCheck,
      clearCart,
      updateCartList,
      allCount,
      allPrice,
      isAll,
      selectedCount,
      selectedPrice,
    };
  },
  {
    persist: true,
  }
);
